There's a pretty flower that's popping up over the countryside in shades of white and pink and mauve. I dug some of it up many years ago and was happy when it flourished on my property. Now that I garden with native plants, I'm not so pleased with its enthusiastic self-seeding ways, and I'm busy pulling it out.Locals call it wild phlox, but its proper name is Dame's Rocket and it comes from Eurasia. A similar plant will be in flower soon, pale pink, harder to pull up if it arrives uninvited because of roots that send out runners – it's called Bouncing Bet and is native to Europe and western Siberia.The wildflowers that we enjoy as an expression of nature and wilderness are more likely to be a manifestation of colonization – the wilderness of other continents, disrupting native ecosystems. This was bought home to me when I made a list last June of herbaceous plants in bloom at Tiny Marsh, part of work for a two-year biological inventory led by environmental consultant Bob Bowles. Only one quarter (7 out of 29) of the plants we tallied were native; the rest were introduced, mainly from Europe.Read more

Last week, I was the speaker at a fundraiser for the Midland branch of the Ontario Society for the Prevention of Cruelty to Animals (a good cause, and a fun event). My theme was 'Saving the World with Native Plants... and enjoying every minute!"

Saving the world might sound overstated. But if you familiarize yourself with the work of Doug Tallamy, chair of Entomology and Wildlife Ecology at the Unversity of Delaware, you will realize that we are moving into a biodiversity crisis. If we carry on, we will squeeze all the species that need wilderness to survive right off the planet. But he believes we, the world's gardeners, can turn things around. We can stitch together a patchwork of rural back yards, urban gardens and private spaces and turn them into wildlife refuges and corridors.